Human body

generate energy

Is ________ energylled Breathing in is called inhalation.

Main parts

Al body as a waste gas Breathing out is called chalation ________ of the breathing system.

Oxygen

________ is breathed into the body and.

diaphragm

The ________ allows Lungs to expand and contract.

bronchioles

The ________ are connected to the air sacs alveoli.

trachea mucus

The ________ that trap and kill germs in the inhaled air entering the trachea by speacial flap called epiglottis.

millons of air sacs

Lungs have ________ allow exchange of respiratory gases.

rubber sheet

When the ________ is pulled down wards by the string the balloons are filled with air.